1989_MELPS_7700_Software_Manual

SBe
Operation
Acc, C ~ Acc - M - C
Subtract with Carry
SBe
Description
Subtracts the contents of memory and the 1 's complements of carry flag from the
contents of the accumulator, and places the result in the accumulator. Executed
as a binary subtraction if the decimal operation mode flag 0 is set to O. Executed
as a decimal subtraction if the decimal operation mode flag 0 is set to 1.
Status flags
IPL:
N
v
m
x
o
Not affected.
Set to 1 when bit 15 (or bit 7 if the data length selection flag m is set to 1) of
the operation result is 1. Otherwise, cleared to O. Meaningless for decimal
subtraction.
Set to 1 when binary subtraction of signed data results in a value outside the
range of -32768 to +32767 (-128 to +127 if the data length selection flag m is set
to 1). Otherwise, cleared to O. Meaningless for decimal subtraction.
Not affected.
Not affected.
Not affected.
Not affected.
Z Set to 1 when the result of operation is O. Otherwise, cleared to O.
C Set to 1 when the result of operation is equal to or larger than O. Otherwise,
cleared to 0, and a borrow is indicated.
Addressing mode Syntax Machine code Bytes Cycles
Immediate SBC A, #imm E916, imm 2 2
Direct SBC A, dd E516, dd 2 4
Direct indexed X SBC A,dd, X F516, dd 2 5
Direct indirect SBC A, (dd) F216, dd 2 6
Direct indexed X indirect SBC A,(dd, X) E116, dd 2 7
Direct indirect indexed Y SBC A,(dd), Y F116, dd 2 8
Direct indirect long SBCL A, (dd) E716, dd 2 10
Direct indirect long indexed Y SBCL A, (dd), Y F716, dd 2 11
Absolute SBC A,mmll ED16,II,mm 3 4
Absolute indexed X SBe A, mmll, X FD16, II, mm 3 6
Absolute indexed Y SBe A, mmll, Y F916, II, mm 3 6
Absolute long SBe A, hhmmll EF16, II, mm, hh 4 6
Absolute long indexed X SBe A, hhmmll, X FF16, II, mm, hh 4 7
Stack pointer relative SBe A, nn, S E316, nn 2 5
Stack pointer relative SBC A, (nn, S), Y F316, nn 2 8
indirect indexed Y
(Note1) This table applies when using the accumulator A. If using the accumulator B, replace "A" with "B".
In this case, "4216" is added at the beginning of the machine code, the bytes-count increases by 1
and the cycles-count increases by 2.
(Note 2)When operating on 16-bit data in the immediate addressing mode with the data length selection flag
m set to 0, the bytes-count increases by 1.
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